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1/**
2* Name: wx/math.h
3* Purpose: Declarations/definitions of common math functions
4* Author: John Labenski and others
5* Modified by:
6* Created: 02/02/03
7* RCS-ID: $Id$
8* Copyright: (c) John Labenski
9* Licence: wxWindows licence
10*/
11
12/* THIS IS A C FILE, DON'T USE C++ FEATURES (IN PARTICULAR COMMENTS) IN IT */
13
14#ifndef _WX_MATH_H_
15#define _WX_MATH_H_
16
17#include "wx/defs.h"
18
19#include <math.h>
20
21#ifndef M_PI
22 #define M_PI 3.1415926535897932384626433832795
23#endif
24
25/* Scaling factors for various unit conversions: 1 inch = 2.54 cm */
26#ifndef METRIC_CONVERSION_CONSTANT
27 #define METRIC_CONVERSION_CONSTANT (1/25.4)
28#endif
29
30#ifndef mm2inches
31 #define mm2inches (METRIC_CONVERSION_CONSTANT)
32#endif
33
34#ifndef inches2mm
35 #define inches2mm (1/(mm2inches))
36#endif
37
38#ifndef mm2twips
39 #define mm2twips (METRIC_CONVERSION_CONSTANT*1440)
40#endif
41
42#ifndef twips2mm
43 #define twips2mm (1/(mm2twips))
44#endif
45
46#ifndef mm2pt
47 #define mm2pt (METRIC_CONVERSION_CONSTANT*72)
48#endif
49
50#ifndef pt2mm
51 #define pt2mm (1/(mm2pt))
52#endif
53
54
55/* unknown __VISAGECC__, __SYMANTECCC__ */
56
57#if defined(__VISUALC__) || defined(__BORLANDC__) || defined(__WATCOMC__)
58 #include <float.h>
59 #define wxFinite(x) _finite(x)
60#elif defined(__MINGW64__) || defined(__clang__)
61 /*
62 add more compilers with C99 support here: using C99 isfinite() is
63 preferable to using BSD-ish finite()
64 */
65 #define wxFinite(x) isfinite(x)
66#elif ( defined(__GNUG__)||defined(__GNUWIN32__)||defined(__DJGPP__)|| \
67 defined(__SGI_CC__)||defined(__SUNCC__)||defined(__XLC__)|| \
68 defined(__HPUX__) ) && ( !defined(wxOSX_USE_IPHONE) || wxOSX_USE_IPHONE == 0 )
69#ifdef __SOLARIS__
70#include <ieeefp.h>
71#endif
72 #define wxFinite(x) finite(x)
73#else
74 #define wxFinite(x) ((x) == (x))
75#endif
76
77
78#if defined(__VISUALC__)||defined(__BORLAND__)
79 #define wxIsNaN(x) _isnan(x)
80#elif defined(__GNUG__)||defined(__GNUWIN32__)||defined(__DJGPP__)|| \
81 defined(__SGI_CC__)||defined(__SUNCC__)||defined(__XLC__)|| \
82 defined(__HPUX__)
83 #define wxIsNaN(x) isnan(x)
84#else
85 #define wxIsNaN(x) ((x) != (x))
86#endif
87
88#ifdef __cplusplus
89
90 #ifdef __INTELC__
91
92 inline bool wxIsSameDouble(double x, double y)
93 {
94 // VZ: this warning, given for operators==() and !=() is not wrong, as ==
95 // shouldn't be used with doubles, but we get too many of them and
96 // removing these operators is probably not a good idea
97 //
98 // Maybe we should always compare doubles up to some "epsilon" precision
99 #pragma warning(push)
100
101 // floating-point equality and inequality comparisons are unreliable
102 #pragma warning(disable: 1572)
103
104 return x == y;
105
106 #pragma warning(pop)
107 }
108
109 #else /* !__INTELC__ */
110 wxGCC_WARNING_SUPPRESS(float-equal)
111 inline bool wxIsSameDouble(double x, double y) { return x == y; }
112 wxGCC_WARNING_RESTORE(float-equal)
113
114 #endif /* __INTELC__/!__INTELC__ */
115
116 inline bool wxIsNullDouble(double x) { return wxIsSameDouble(x, 0.); }
117
118 inline int wxRound(double x)
119 {
120 wxASSERT_MSG( x > INT_MIN - 0.5 && x < INT_MAX + 0.5,
121 wxT("argument out of supported range") );
122
123 #if defined(HAVE_ROUND)
124 return int(round(x));
125 #else
126 return (int)(x < 0 ? x - 0.5 : x + 0.5);
127 #endif
128 }
129#endif /* __cplusplus */
130
131
132#if defined(__WINDOWS__) && !defined(__WXWINCE__)
133 #define wxMulDivInt32( a , b , c ) ::MulDiv( a , b , c )
134#else
135 #define wxMulDivInt32( a , b , c ) (wxRound((a)*(((wxDouble)b)/((wxDouble)c))))
136#endif
137
138#if wxUSE_APPLE_IEEE
139#ifdef __cplusplus
140 extern "C" {
141#endif
142 /* functions from common/extended.c */
143 WXDLLIMPEXP_BASE wxFloat64 wxConvertFromIeeeExtended(const wxInt8 *bytes);
144 WXDLLIMPEXP_BASE void wxConvertToIeeeExtended(wxFloat64 num, wxInt8 *bytes);
145
146 /* use wxConvertFromIeeeExtended() and wxConvertToIeeeExtended() instead */
147#if WXWIN_COMPATIBILITY_2_8
148 wxDEPRECATED( WXDLLIMPEXP_BASE wxFloat64 ConvertFromIeeeExtended(const wxInt8 *bytes) );
149 wxDEPRECATED( WXDLLIMPEXP_BASE void ConvertToIeeeExtended(wxFloat64 num, wxInt8 *bytes) );
150#endif
151
152#ifdef __cplusplus
153 }
154#endif
155#endif /* wxUSE_APPLE_IEEE */
156
157
158#endif /* _WX_MATH_H_ */